Keysight Test Solutions for 802 · Keysight Test Solutions for 802.11ad Philip Chang Dec 08, 2015 1...

Keysight Test Solutions for 802.11ad

Philip Chang

Dec 08, 2015

1

2

Use Model Example

Wireless Display/Audio/

Docking

Uncompressed transfer to computers, portable

devices to one or more monitors/projectors,

Distribution of HDTV

Upload/Download | Mobile

Applications

Kiosk Download, Movies to computer for editing,

library sharing, Cordless Computing

Networking/Access Points Wireless Gigabit Ethernet

Small Cells & Backhaul

Mesh networks, Peer-to-Peer, Tri-band (2.4/5/60

GHz) Access Points.

LTE and WiFi CA

802.11ad/WiGig format : Applications targeted High Data Throughput over short range using 60GHz RF, 2GHz channels with Beamsteering technology

MOBILE UE APPLICATIONS WIRELESS DISPLAY NETWORKING / APs

BACKHAUL

http://www.intel.com/index.htm?iid=HPAGE+header_intellogo&

802.11ad Overview

Current chipsets being rolled out

support only MCS -12

WW Channel allocations

3

Modulation & Coding Schemes

Current chipsets being rolled out

support Channels 2 & 4 at least; few

cover all 4 as standard

• 2.4G, 5G bands are congested and lack the capability of delivering multi-gigabit data

• The 60 GHz band is ‘green field’ and can meet the demand for short range multi-gigabit links

IEEE802.11ad Test items

EVM

Transmitter test

21.3.2 Transmit mask

21.3.3.3 Center frequency tolerance

21.3.3.4 Symbol clock tolerance

21.3.3.5 Transmit center frequency

leakage

21.3.3.6 Transmit ramp-up and ramp-

down

21.4.4.1.2 Transmit EVM (Control PHY)

21.4.5.1.2 Transmit EVM (OFDM)

21.5.4.1.3 Tx flatness

21.6.4.1.1 Transmit EVM (SC PHY)

Receiver test

21.3.3.8 Maximum input requirement

21.3.3.9 Receive sensitivity

SEM

4

11ac Transmit Spectrum Mask for 160 and 80+80 MHz 160 MHz spectral mask is an extension of 40 and 80 MHz masks

For 80+80 MHz, mask is linear sum of the separate 80 MHz masks for

values from -20 dBr to -40 dBr. For values from 0 to -20 dBr, use higher

value.

5

80+80 MHz signals, with center frequencies separated

by 160 MHz

160 MHz Channel

11ac Transmitter Error Vector Magnitude (EVM)

Test method same as 802.11n:

• Channel estimation (equalizer training) based on preamble only

• Pilots used for phase tracking

• Minimum 16 data symbols in frame, RMS average over at least 20 frames

Modulation Coding

Rate

802.11n

EVM (dB)

802.11ac

EVM (dB)

BPSK 1/2 -5 -5

QPSK 1/2 -10 -10

QPSK 3/4 -13 -13

16QAM 1/2 -16 -16

16QAM 3/4 -19 -19

64QAM 2/3 -22 -22

64QAM 3/4 -25 -25

64QAM 5/6 -28 -27

256QAM 3/4 N/A -30

256QAM 5/6 N/A -32

7

802.11ad Reference Solution Signal creation and demodulation

DUT

Keysight SW (Signal Studio, SystemVue, VSA)

Acq'd Signal

81199A Wideband

Waveform Center (WWC)

89601B VSA SW

WARNING: Exit 89600 VSA Software before changing instrument setup

Dem

od

M8190A Wideband AWG (I/Q Generation)

Differential IQ

Waveform

N1999A 60GHz/5GHz

Down-converter N5183A MXG (Rx LO)

N5152A 5GHz/60GHz

Up-converter E8267D PSG

N5183A MXG (Tx LO)

Infiniium Scope

Could use VDI

for V/E/W-Bands

M1971E Smart Mixer

VDI UDC

63GHz Scope New

VDI UDC

Keysight 81199A User Interface

VDI Configuration

I+ I- Q+ Q-

9 GHz, 2 dBm

11.58 GHz, 2 dBm

(69.48 GHz / 6)

Notes:

• Connect all 10 MHz references together. Use PSG as Ref Source.

• Connect Scope, SA, M8190A to LAN

CH1

Insert 60.48 GHz filter with 2 GHz

BW for SEM measurements

11.395 GHz, 2 dBm

(68.37 GHz / 6)

SA with External Mixer useful to check for spurs,

harmonics, and power levels at RF & mmW.

IF output at 7.89 GHz

NOTE: For lab on Left side of room, set Freq to 67.37

GHz since S-Scope only has BW up to 8 GHz

On left side of room

your IF=6.89 GHz

1

0

VDI up/down converter configuration Internal Block Diagram

VDI Configuration

Up Converter w/ High LO Input

Up Converter w/ Low LO Input Down Converter w/ Low LO Input

Down Converter w/ High LO Input

= Not used in this configuration

Recommended Configurations

mmW Performance VDI Up Converter Maximum Output Power

VDI Up Converter /w Amp & filter: ~-3 dBm VDI Up Converter w/ filter, no amp: ~-25 dBm

Input Signal Configuration

• +12 dBm, about maximum where distortion starts to get worse

• 2 GHz BW

• 802.11ad 16QAM signal, MCS12

M1971E Configuration

I+ I- Q+ Q-

Aux RF In LO/IF

10 MHz USB 9 GHz, 2 dBm

11.58 GHz, 2 dBm

(69.48 GHz / 6)

Notes:

• Connect all 10 MHz references together. Use PSG as Ref Source.

• Connect Scope, SA, M8190A to LAN

CH1

USB 10 MHz Ext Mixing Port

Insert 60.48 GHz filter with 2 GHz

BW for SEM measurements

mmW Performance SEM: Spectral Emission Mask Measurements

• SEM mask will be available as preset in XA18 FW (Summer 2016 timeframe)

• Note: Mask is available as state file along with presets for ACPR (currently not defined)

• Contact Randy/Moto/S800 archives for copy of state file, Note: also requires proto FW.

802.11ad Transmit Mask Requirements

Note: Not clear how far beyond 3.06 GHz offset

customers want to make measurements


Conclusions:

• M1971E can meet requirements of 802.11ad mask

• Only tested at 60.48 GHz since we only have 1 filter available today

• Requires VDI with filters at other frequencies to validate; but likely works

• N5152A introduces spur, so cannot validate

N5183B - MXG Test Configuration

VDI Up Converter Baseband M8190A

IF E8267D PSG

LO PSG/MXG/EXG

9 GHz 60.48 GHz

69.48 GHz x6 x6

SA X-Series Analyzer VDI Amp

Notes:

• Must remove filter for testing real DUT

• Amp and filter may be required to get signal level

into optimal range of M1971E


M1971E Mask Measurement

Source: N5182A w/ filter

Result: Spur just beyond 3.06 GHz offset

M1971E Mask Measurement

Source: VDI Up Converter w/amp & filter

Result: Spur just beyond 3.06 GHz offset

No filter, mask fails No filter, spectrum similar to above (N5152A includes filter)

mmW Performance Down Converters – Source is VDI up converter

1

7

Conclusions

• Choice of down converter dependent on application

• N1999A has great low level performance

• VDI has impressive EVM over wide range of input levels, not much higher than direct scope meas.

• Smart Mixer requires high drive level, great for optimizing mmW system

• Results may be limited by ‘test source’ performance which is ~2% EVM for this test case

M1971E

Smart Mixer N1999A

Down-converter

63GHz Scope VDI UDC

1

8

mmW Performance Up Converters: 5182A vs VDI

Conclusions

• N5152A and VDI have similar EVM performance. VDI has small edge & requires healthy

input level to get performance.

N5152A

Up-converter VDI UDC

mmW Performance Calculating EVM limits (assuming noise limited)

An example with the M1971E: • Noise floor: -134 dBm/Hz

• BW: For a 2 GHz wide system, this equates to:

• -134 dBc/Hz + 10log (2 GHz) = -41 dBm (over 2 GHz of BW)

• This sets our noise floor.

• 1 dB compression point = ~0 dBm

• Crest factor of ~10 dB for communication signals

• Power level: So average input power level into mixer is ~-10 dBm

• This sets our upper limit on dynamic range

• Dynamic Range = -41 dBm – (-10 dBm) = ~31 dB =10−3120 =2.8%

• This limits the best EVM that can be measured.

M1971E

Smart Mixer

12/8/201

5 2

0

Keysight

Confidenti

al

LO Selection Which source is the best LO? Phase Noise Comparison at 10 GHz

N5173B - EXG E8257D - PSG

N5183B - MXG

*All Sources have the best phase noise option (UNY) (applies to PSG & MXG)

**Scale is 15 dB / div

12/8/201

5 2

1

Keysight

Confidenti

al

LO Selection Which source is the best LO? Phase Noise Comparison at 10 GHz

N5173B - EXG E8257D - PSG

N5183B - MXG

*All Sources have the best phase noise option (UNY) (applies to PSG & MXG)

**Scale is 15 dB / div

This is area is important

1 MHz Offset

LO Selection Which source is the best LO?

N5183B - MXG

PSG is LO MXG is LO EXG is LO

EVM = ~1.8% EVM = ~2.1% EVM = ~2.1%

x6

Up Converter

WARNING: Exit 89600 VSA Software

before changing instrument setup

Baseband M8190A

IF E8267D PSG

Scope Infiniium

LO PSG/MXG/EXG

5 GHz 60 GHz

10 GHz

Test Configuration

Test Signal QPSK

12/8/201

5 2

3

Keysight

Confidenti

al

LO Selection Using a YIG filter on the output of the LO

Phase Noise Comparison at 10 GHz between PSG and MXG

*All Sources have the best phase noise option available (applies to PSG & MXG)

N5183B MXG – with YIG Filter

E8257D PSG

E8257D PSG with YIG Filter

LO Selection Sample demodulation results with YIG filter on output of LO

N5183B - MXG

PSG is LO EXG is LO

EVM ~ 1.7% EVM ~ 1.7%

x6

Up Converter

WARNING: Exit 89600 VSA Software

before changing instrument setup

Baseband M8190A

IF E8267D PSG

Scope Infiniium

LO PSG/MXG/EXG

5 GHz 60 GHz

10 GHz

Test Configuration

Test Signal QPSK

YIG

Filter

802.11ad Design Challenges

• Performance taken for granted at lower frequencies, not so easy to acheive at mm frequencies

• Mismatch, skew, cable lengths matter

mm WaveTechnology

• ~2 GHz Modulation BW

• Data rates up to 6.75 Gbps

• 100x wider modulation bandwidth than 802.11n. 11x wider than 802.11ac

• Complex frequency response (flatness) difficult

Wide Bandwidth

• Built-in multi-element anntenas lack test connection

• Path losses significant

• Over-the-air (OTA) testing required jeapodizes measurement plane

• Multi-path intrinsic in performance and in measurement environment

No Connectors at 60 GHz

25

Q&A

Thank You!

26

mmW Accessories V-Band VDI Amplifier Specs

• Frequency Range: 57-66 GHz

• ~20 dB gain, +10 dBm input damage level

• 10 dB NF

Other VDI Amplifiers Specs

• E-Band, Frequency Range: 71-86 GHz

• D-Band, Frequency Range: 152-162 GHz

• Specs similar to V-Band

VDI Waveguide Filters

• Models currently available

• 57.32-65.8 GHz Use case: Covers all four 802.11ad channels

• 57.32-59.32 GHz Use case: 802.11ad channel 1




• 71-76 GHz Use case: 5G/Backhaul in ‘lightly licensed band’

• 81-86 GHz Use case: 5G/Backhaul in ‘lightly licensed band’

• 152-162 GHz Other mmW

• Insertion loss ~1 dB

Can be purchased directly through VDI. Working on setting up as Keysight orderable parts, but

requires customer order to trigger.

Horn Antennas

Model Frequency Range

N9020AH05 140 – 220 GHz

N9020AH08 90 – 140 GHz

N9020AH10 75 – 110 GHz

N9020AH12 60 – 90 GHz

N9020AH15 50 – 75 GHz

N9020AH19 40 – 60 GHz

mmW Accessories

Keysight Test Solutions for 802 · Keysight Test Solutions for 802.11ad Philip Chang Dec 08, 2015 1...

Documents

Transcript of Keysight Test Solutions for 802 · Keysight Test Solutions for 802.11ad Philip Chang Dec 08, 2015 1...